<!DOCTYPE html>

<html>

<head>
    <title></title>
    <script src='../vue.js'></script>
</head>

<body>
    <div id="app-3">
        <p v-if="seen">现在你看到我了</p>
    </div>
    <script>
        var app3 = new Vue({
            el: '#app-3',
            data: {
                seen: true
            }
        });
    </script>
</body>


</html>